code: def test_assign_type_error(self):
      values = [55, None]
      for value in values:
          with self.assertRaises(TypeError):
              Datetime(MagicMock(), MagicMock()).assign(value)
  
file_path: neptune-client/tests/unit/neptune/new/attributes/atoms/test_datetime.py
imports: from datetime import datetime
  from mock import MagicMock, patch
  from neptune.attributes.atoms.datetime import Datetime, DatetimeVal
  from neptune.internal.operation import AssignDatetime
  from tests.unit.neptune.new.attributes.test_attribute_base import TestAttributeBase
label_desc: Use image node_id 2 for calling the TestDatetime obj's underlying member method code with example usage: obj.test_assign_type_error() without return types